1. the side of an object that is opposite its front

Similar word(s): rear

Definition categories: location, face, side

2. the fleshy part of the human body that you sit on

Similar word(s): behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hindquarters, keister, nates, posterior, prat, rear, rump, seat, stern, tail, tush

Definition categories: body

Sentences with backside as a noun:

- The backside of the building faced an alley, and was covered in grime and scrawled graffiti.

- After riding the horse all day for the first time, I had painful blisters on my backside.